At 65 kg your small board should be no bigger than about 85 liters, assuming that you have decent jibe skills. This board will float you quite well.
On the other hand, I think it may be too big in 4.2 conditions in particular if it is choppy.
Without knowing your true skill level it is difficult to say, but I would be inclined to say "not much more than 80 liters, and maybe even a little less".
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